With a reasonable expectation of approval on the part of all men versed in recent evolution of hydraulics, it may be stated at this time that there has sprung into existence that which may be aptly called modern hydraulics.
The science of mechanics in general, and of hydraulics in special, has been represented amongst the living generation by two schools of extremists. This fact may be plainly shown by quoting from two authors of equally high merit. R, G. Blaine, Senior Demonstrator and Lecturer in the mechanical engineering department of the City and Guilds of London Institute's Technical College, in the preface to his recently published book on "Hydraulic Machinery," expresses his opinion on the proper method to be followed in treating subjects of mechanics or hydraulics, as follows :
" An attempt is usually made to avoid using the calculus or to disguise its use in the language of so-called elementary mathematics ; this course is not altogether free from objections, the proofs given being usually long and not too exact."
John C. Trautwine, in the preface to his "Civil Engineers' Pocketbook," after recommending by name of author some works on matters of engineering, expresses his opinion on the same subject as follows:
"The writer does not include Rankine, Moseley and Weisbach, because, although their books are the productions of master minds, and exhibit a profundity of knowledge be-VOL. CXLVI. No. 873.